.1925: How to delete "permanent" apps (Games, etc)?

So the usual method of copying the specific files (games, mmagic, airtunes, howto) back onto the phone so they change from "permanent" status to "uninstall" with a usable tick box isn't working for me on this latest leak (10.2.1.1925). Based on other folks claimed workarounds, I've tried repeatedly copying them, as well as copying older version of the files from .1055 and .1259, without success. Has anyone come up with a method that works?

(And save your breath telling me to just put them in a folder and hide it - that's what I've done for now, but I want them gone to free up space & memory. Don't need 'em, don't want 'em.) If I can go through and delete language files, as well as apps I don't use like linkedin and foursquare, then I ought to be able to delete Games & other shyt too).